Seam for sewed articles.



F. BAKER & L. JACOBS.

SBAM FOR SEWED ARTICLES.

APPLIOATION FILED JULY 25, 1910.

1,072,291 Patented Sept. 2, 1913.

2 SHEETS-SHEET 1.

LOLUMDXA PLANOGRAPH c0" WASHINGTON, n. c.

F. BAKER & L. JACOBS.

SEAM FOR SEWED ARTICLES.

APPLICATION FILED JULY 26,1910.

1,072,201. a nt d Sept. 2, 1913.

2 SHEETS-SHEET 2.

mLuMlHA I'LANOURAPH to WASHINGTON n. c.

glide:

" it'lilf itlli ll ltlliiili FREDERICK BAKER, OF BLACKEEATH, AND LESSER JACOBS, OF LONDON, ENGLAND, ASSIGNORS TO "BAKER SEVJING MACHlNES TBiIlS]? LIMITED, OF LONDON, ENGLAND.

SEAM FOR SE'WED ARTICLES.

IAlTfZJltltl.

Original application filed May 23, 1908, Serial No.

Specification of Letters Patent.

Pa t entcd S pt. 2, H913.

42 L702. Divided and this application filed July 25,

1910. Serial No. 573,683.

To (IN cello/u it nu/ u concern.

lie it known that we, l nnnmnon BAKER and LESSER .lnoons, both subjects oi the King of Great Britain, residing, respectively, at 42 Lee road, lilacaheath, in the county of Kent, l'lngland, and 1? Hanover Square, in the county of London, l lngland, have invented a certain new and useful Seam tor Sewed r lrticles, being a division ot an application filed by us on Way 23, Laos, Serial No. 434,702, since become latent No. 1,014,033, of which the following is a specitication.

This invention relates to an improved novel type otf stitching, the chief object being to enable a locked or 'last stitch to be produced with. the employment ot' a single thread, thus dispensing with the use of a shuttle or bobbin carrier.

According to the present invention the method of sewing consists in draw g out a loop of thread from the needle a'itci the latter has penetrated the material to be sewn, releasing it when drawn out, causing it when being drawn up to be arrested amt retained by a tension device, drawing out one or more other loops in succession from the needle, passing them, (it more than one), in Sl'lCCCSSlOli over the liight oi? the first loop to embrace it at intermediate points in its length, drawing them up in succession so that they lock the lirst loop to the material, drawing out another loop through the bight 0:1? the first loop, and liberating the said first: loop 'lrom the tension device. The loop that has just passed through the bight ot the first loop is then retained in tension and the sequence of operations is repeated. in this way there is obtained a type oi stitching consisting ot a series of interlinked loops, which may be termed main loops, each ot which is embraced by and locked to one or more loops termed sub-loops. The sub-loops which are drawn through the main loop before being made to embrace it, not only embrace the main loop but are themselves embraced by it, and thereby result in the formation of a knotted stitch. Each main loop a'lter being drawn out is released, and in being drawn up is arrested by the above mentioned tension device at a certain point, the distance of which from the usual needle hole determines the length of the main loop.

'lho arresting member ot the device moves forward step by step as the feeding forward (if the material takes place with the result; that uniformly spaced stitches can be produced. The means employed For producing stitches ot this character comprise a movable loop catcher or book which may convcnimitly torm part of or be Inouuted upon a disk, and the tension device, which is situated at one side of the path of movement oi the said loop catcher or book. The loop catcher or book engages with the needle thread at each descent of the usual reciprocating needle, and alter drawing out a loop of thread, releases the said loop in such a position that when being drawn up it; passes over the surlacc of the aforesaid tension device. This device contains the betorc mentioned arresting member For arresting and yieldingly holding a loop in tension but allowing one or more succeeding loops to pass completely over it before it releases the loop it has been retaining: each retained loop becon'les a main loop, and each unarrcstcd loop becomes a sub-loop. It may here be pointed out that each sub-loop constitutes a stitch, and also each point of intcrlinlmgc oi the main loops, and that each stitch is comp eted betore the formation of the next stitch begins.

in order that the invention may be clearly understood and readily carried into etlbct. the same will now be described more fully with rclcrence to the accompanying drawings which illustrate the stitches, and, by way oi. example, one construction of machine lor carrying out the invention.

l igure '1 is a side elevation, and Fig. 2 a. plan view from underneath, of two pieces o'l material sewn by our knotted type of stitching. The thread is o't course only shown diagrammatically, the stitching being much enlarged and drawn up only very loosely. Fig. is an elevation o'l part of a machine constructed tor producing stitching in accordance with this invention. Fig. i is an enlarged side elevation oi the tension dcvicc seen in Fig. 3. Fig. 5 is a 'lacc view showing the needle thread in the act ot being engaged preparatory to the drawing out at a loop by the loop catcher or hook on the disk. Fig. (3 shows the disk advanced to a. position where the loop has been drawn out and the hook tilted to the disengage the loop therefrom and transfer it to the lower end of the tension device ready to be drawn up over the back of the same. Figs. 7, 7 and 7 illustrate a modified form of tension device hereinafter de scribed.

A is the needle, B the usual needle plate, C the needle thread, D the disk carrying the loop catcher or hook (Z and E the tension device. The disk D is preferably formed in one piece with its driving spindle or shaft. The hook (.Z forms part of a pivoted member (Z adapted to be rocked on a pivot (Z by a toothed quadrant (Z the teeth of which engage with teeth on one end of the member (Z. Carried on the quadrant (Z is a cam like projection (i adapted during a revolution of the disk to engage with proj ections (Z (Z depending from a bridge piece carried by the bearing plate H, in such a manner "that upon meeting the projection (F, the hooked end of the member d is l own outward, while the meeting with projection d imparts motion to the iooked member again, in the opposite direction. The purpose of these movements will be apparent later on in the description.

At the back of the disk are cam grooves (Z and (Z and pins fixed to sliding members (Z (Z are arranged to work in the aforesaid grooves as the disk D rotates. The sliding members (Z (P extend beyond the periphery of the disk and beyond the casing e of the tension device E and have lateral projections (Z and (Z which extend over the back face of the said casing and make contact with it to hold it in position on the periphery of the disk, which is grooved to accommodate a projecting rib on said tension device casing and thereby prevent lateral movement of the latter. In order to prevent any loose or uncertain action of the projection (Z that might otherwise occur owing to the wearing of the walls of the groove (E and of the pin on the sliding member c, a spring (P may be provided to constantly press the said pin against the inner edge of the groove.

The tension device casing, shown on a large scale in. Fig. 4, is equipped with a rocking member 6 provided with a hook c and controlled by a spring 0 the casing 0 being slotted to expose the hook 6 The rocking member 6 carries a pin or projection a which is normally engaged by a pivoted arm 0 to prevent the rocking of the member 6. The member 0 is however released during a certain part of the revolution of the disk D by the lug (Z thereon in the manner to be hereinafter described. The mechanism for feeding the material forward step by step is of the well known rind. i

As soon as the needle descends through its material to be sewn, the hook (Z on the member d, which is at this point in its inward position, engages the thread (Fig. 5) and carries it around as it proceeds on its revolution, the sides of the loop falling one on each side of the disk and tension device, until the projection (Z comes into contact with the projection (Z on the bridge piece G (Fig. 6 This contact causes the member d to assume its outward position and allows the loop of thread to escape from the hook cZ It is to be noted that this release of the loop has taken place before the hook has moved through 180 from its point of engagement with the thread. Consequently the loop when drawn up passes along the same side of the axis of the disk as that on which it was drawn out instead of on the other side of this axis as is the case in prior rotary disk machines. The loop of thread is now pulled by the usual take up back over the tension device, the retaining sliding pieces (Z and (Z being operated successively by the cam grooves (Z and d9 at this moment, in order to allow the thread to pass between them and the tension device casing c. The loop is then arrested by the hook 6 on the rocking member 6 and held taut. The loop cannot avoid entering the hook c owing to the guide 6* on the underside of the needle plate B. As the disk continues its rotation, the lug (Z comes into contact with a projection 65X, on the arm 6 causing it to lift clear of the pin 6 and allowing the member 6 to move forward step by step as the material is fed onward. The member (Z also comes into contact with the projection (Z which brings the member (1 inward, and a guide bar 0*, as shown in Fig. 3, prevents its tendency to fly outward on its upward journey before engaging the thread and beginning its downward course. The needle is by this time descending'again and in. doing so, passes down between the sides of the retained loop, which is a main loop of definite length. The thread is again caught by the hook (Z*, and a second loop is drawn'and carried around to the lower end of the tension device and then thrown off as before.

Owing to the hook 6 having been released as above described and drawn away from the guide 6* by the forward movement of the material, this second loop, which forms a sub-loop, in being drawn over the tension device casing escapes the hook e and therefore passes over the main loop which is still being held by the hook 6 and is drawn tautagainst the material forming a knot with the main loop firmly looking it at one portion against the material. On the next descent of the needle it passes again through the remaining portion of the main loop and a sub-100p is again passed over it as just previously described, the main loop again moving a step forward owing to the feeding of the material. This last step forward of the main loop, causes it to overcome the tension of the spring 0" and escape from the hook 0 after which it is arrested by the upward projection c secured to the end of the casing e. In this position, the bight of the loop is ready for the needle to pass through it. As soon as the loop escapes from the hook c", the member a springs back to its normal position, the pin 0 engaging with the pivoted arm (1 and securely retaining the member c in its locked position. 011 the next descent of the needle, it passes through the bight of the main loop, which is held as above stated, and a new main loop is drawn oil and caught on the hook 0 as in the original formation of the old main loop but it has been drawn through the bight oil the old main loop. As the new main loop is pulled taut on the hook c it lifts the bight of the old main loop clear of the upward projection c, which returns to its normal position. The bight of the old main loop is thus secured by the new main loop which is again locked in two places as before.

\Vhen the needle descends through the bight of the old main loop it is desirable that it should do so as close as possible to the end of the bight so as to produce a neat stitch. To enable the needle to descend as described, the needle plate is recessed to allow the tension device casing to be placed in such a position as to cause the bight of the loop, just prior to its release, to be placed close against the underside of the material and in position for the needle to enter it when it descends.

A modified form of tension device is shown in Figs. 7, 7 and 7 In this arrangement, the member 71, which corresponds to the member (2 of Fig. 4i, carries a hook 0 pivoted thereon at it and is arranged to slide in a segn'lental groove in the casing or body portion 7L3, being retained in said groove by a plate h. A spring h attached at one end to the casing h and at the other end to a pin on the sliding member 70, serves to pull the said member it into a position in which a lug or tail piece 7r on the hook 6 catches against the stationary pin 71, on the casing or body portion 719. The hook 11 is then, as shown in Fig. 7, projecting beyond the casing or body portion it" through an opening in it and is ready to catch a main loop of thread.

(Z and (Z are the projections operating siu'rilarly to those already described with relerence to Fig. 3, with the exception that while the projection (Z engages with the casing or body portion 7t only, the projection (Z projects through the latter, and en gages with a notch h on the member h. N hen therefore a main loop of thread has been caught by the hook 0 the projection (Z' prevents the member h from moving while the thread of the main loop is being drawn by the take-up. Prior however, to the next loop, which is the first subloop, being drawn over the casing or body portion, the projection (W is temporarily retracted as hereinbet'ore described, and owing to the feeding mechanism having now caused a tension to be exerted on the hook c'-" by the thread, the sliding member 11. slides to the left toward the needle against the influence of the spring 7r. The lug or tail piece it then moves away from the pin 71? and as sumes a more horizontal attitude in which position the hook c lies below the top edge of the casing or body portion h and therefore allows the subloop to pass over it. The next sub-loop also passes over the hook, the latter being drawn stitch by stitch to the left in opposition to tln action of the spring 7r until it has reached a position in which the lug 7t approaches the periphery of the disk I) as shown in Fig. 7. A project-ion, such as the lug (Fig. 3),l'hen engages with the end of the lug 7r as the disk rotates and thereby tilts the said lug lr"; the hook 0 is consequently rocked sulliciently to release the loop. The hook c'-" and sliding member ii. are then returned by the spring it to their normal position and the hook c is then ready to engage with another main loop.

The hook c is pivoted on a pin in the sliding member 71. in such a way that it can slide laterally on the pin. A spring 0 is secured to the sliding member h and its free end reaches over the aforesaid pin on one or other side of the pivoted book 0 In the position shown in Fig. 7" a main loop when caught and held by the hook 0 will be kept to one side of the needle with the result that the sub-loops are drawn down to one side oi? the ma in loop. The hook 0 however. linally moves up close enough to the path of the needle tor the latter to pass through the bight oi? the old main loop in forming the new main loop.

lV hat we claim and desire to secure by Letters Patent oi the United States is 11. A seam conun'ising puncturable material, and a single thread bearing on one side of the material and having a series of main loops and sub-loops drawn through the material t'rom the said thread, each main loop being ol a preiletermined length and bearing upon the other side of the material with its bight interlinked with the next main loop and its intermediate part embraced by and embracing a sub-loop which tluireby locks it to the material.

2. A seam comprising two or more pieces ol material and a line ol? stitching formed by a. single thread having a series of main loops and sub-loops therein drawn through the n'ialerial, the main loops being connected with one another by a chainstitch, and the sub-loops each locked by a knotted stitch to one ol the main loops.

them to the main loop, and a second relatively long main loop passing through the bight of the first long main loop.

In testimony whereof we afllx our signatures in presence of two witnesses.

FREDERICK BAKER. LESSER JACOBS,

3. A seam for uniting punoturable ma terial with a single thread comprising a thread which passes through said material and extends in a relatively long main loop in the line of the seam, a plurality of relatively shorter sub-loops which pass through the relatively long main loop and then around said main loop to embrace it at intermediate points in its length and about which said sub-loops are drawn to lock \Vitnesses A. H. STEVENS, T. SELBY VVARDLE.

Copies of this patent may be obtained for five centseach, by addressing the Commissioner of ZPatents, Washington, 1). C. 

